Discussion
Find the unit digit of 13!
Answer: A
For any integer \(n \ge 5\), the factorial \(n!\) will contain the factors 2 and 5. The product of 2 and 5 is 10. Any number multiplied by 10 will have a unit digit of 0. Since 13 is greater than 5, \(13!\) will have a unit digit of 0.
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